DIN EN 15420 E : NOV 2011

National foreword<br>Foreword<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Classification of boilers<br>5 Constructional requirements<br>6 Operational requirements<br>7 Test methods<br>8 Marking and instructions<br>Annex A (informative) - National situations<br>Annex B (informative) - Special national conditions<br>Annex C (informative) - A-deviations<br>Annex D (informative) - Classification of type <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C boilers<br>Annex E (informative) - Practical method of calibrating<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;the test rig to enable the heat loss<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D[p] to be determined<br>Annex F (informative) - Main symbols and abbreviations used<br>Annex G (informative) - Compilation of test conditions<br>Annex H (informative) - Valving<br>Annex I (informative) - Determination of the heat losses <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;from the test rig of the indirect<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;method and the contributions of the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;circulating pump of the test rig<br>Annex J (informative) - Means of determining the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ignition time at full rate<br>Annex K (informative) - Example of the calculation of the <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NO[x] weighting factors for a boiler<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with several rates<br>Annex L (informative) - Calculation of conversions of NO[x]<br>Annex M (normative) - Test apparatus for type C2 boilers <br>Annex N (informative) - Requirements and test methods <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for separate air supply and combustion products <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;evacuation ducts of type C6 boilers<br>Annex O (informative) - Use of test gases<br>Annex ZA (informative) - Clauses of this European <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Standard addressing essential<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;requirements or provisions of EU Directives<br>Bibliography

Defines the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan-assisted atmospheric burners or fully premixed burners, and are hereafter referred to as 'boilers'.